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The MpANT-Auxin Loop Modulates Marchantia polymorpha Development
Dipp-Álvarez Melissa1, Lorenzo-Manzanarez J Luis1, Flores-Sandoval Eduardo2
1Advanced Genomics Unit (LANGEBIO) of CINVESTAV, Irapuato, Guanajuato, Mexico.
Physiologia Plantarum
|June 30, 2025
Summary
The study reveals that the MpANT gene in Marchantia polymorpha is crucial for meristem maintenance and cell proliferation, acting in a regulatory loop with auxin and MpPIN1 to control plant development.
Area of Science:
- Plant developmental biology
- Evolutionary developmental biology
- Molecular genetics
Background:
- AINTEGUMENTA-LIKE/PLETHORA/BABYBOOM (APB) genes are ancestral developmental regulators in land plants.
- In Arabidopsis thaliana, APB genes are auxin-induced and vital for organ development in dividing cells.
- Marchantia polymorpha, an early-diverging liverwort, has one APB ortholog, MpANT.
Purpose of the Study:
- To characterize the function of the MpANT gene in Marchantia polymorpha.
- To investigate the role of MpANT in meristem maintenance and cell proliferation.
- To elucidate the regulatory interactions of MpANT within auxin signaling pathways.
Main Methods:
- Analysis of MpANT expression using transcriptional fusion lines.
- Investigating MpANT promoter activity and response to auxin.
- Generating and analyzing loss- and gain-of-function MpANT mutants.
- Assessing MpANT's influence on auxin distribution and MpPIN1 activity.
Main Results:
- MpANT is predominantly expressed in meristematic regions.
- MpANT expression is regulated by auxin and auxin transport, acting downstream of ARFs.
- Loss- and gain-of-function studies demonstrate MpANT's essential role in meristem maintenance and cell proliferation.
- MpANT positively regulates MpPIN1, influencing auxin distribution and forming a feedforward loop.
Conclusions:
- MpANT is a key transcription factor in Marchantia development, regulating meristem function.
- A feedforward regulatory loop involving auxin, MpANT, and MpPIN1 is critical for Marchantia development.
- This study provides insights into the conserved and divergent roles of APB genes in plant evolution.
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